CAA NZ AME Licence Exam - Turbine Engines (Subject 6) case studies
CAA NZ AME Licence Exam - Turbine Engines (Subject 6) · Put your knowledge to work in context.
Subject 6: Turbine Engines is one of the knowledge-examination subjects that CAA New Zealand administers for people seeking an Aircraft Maintenance Engineer licence with a turbine engine rating. It is aimed at trainee and practising AMEs, and at engineers converting from piston engines, who need to show they understand how gas turbine engines work and how they are maintained to an airworthiness standard. The CAA NZ AME Licence Exam - Turbine Engines (Subject 6) case studies are 5 cases and about 3,384 words.
1PT6A-114A Cruise Torque Loss and Rising ITT
A Cessna 208B Caravan operating scheduled services around the lower South Island has a PT6A-114A. Over the last 40 flight hours the pilot reports that at the same cruise torque the ITT is 30–40°C higher than the previous month, and maximum cruise torque is about 8% lower.
765 words, about 4 min2M250-C20B Oil Consumption and Chip Detector Warning
An M250-C20B powers a Bell 206B on scenic flights from a remote South Island base. At the 100-hour inspection the engineer finds the oil filter impending-bypass indicator popped, the chip detector has a small fuzz but no flake, and oil pressure has fluctuated between 60 and 75 psi in cruise, where it normally sits steady at 70 psi.
679 words, about 3 min3PT6A-60A Hot Start at Queenstown
During a morning departure from Queenstown, a Beech King Air 350 with two PT6A-60A engines attempts a start on the right engine. OAT is −2°C, battery voltage before start is 23.8 V, and the external power unit is not available.
618 words, about 3 min4CFM56-7B HPT Blade Distress Found on Borescope
During a borescope inspection of a CFM56-7B engine on a Boeing 737-800 at a NZ line station, the engineer finds three adjacent HPT blades with tip-corner burning and one blade with a 2.0 mm notch on the trailing edge. The HPT nozzle guide vanes show minor axial cracks below the AMM limits.
661 words, about 3 min5PT6A-67D EGT Indication Split
An operator of a PT6A-67D-powered aircraft reports that the EGT indication on the #1 engine is 45°C higher than #2 at the same torque and altitude. Both engines start normally, produce normal torque and have no other indications.
661 words, about 3 min